4.14 fixups

Merge pull request rundeck#1270 from rundeck/user-class-api

User Class Mgr API

Merge pull request rundeck#1257 from rundeck/NF-MayDocsChanges

Nf may docs changes

Release Notes YouTube 4.12/13

Merge pull request rundeck#1237 from rundeck/architecture-pdf-3

Update README.md

Merge pull request rundeck#1231 from rundeck/fix-architecture-link

Fix architecture link

fix bad link in Working with Jobs

Clarification and Links on Upgrading Steps

Merge pull request rundeck#1188 from runwaldo/patch-2

word "enviroments" mistyped

H2 CVE Note on Doc page